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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276154b9ed3cd4447b2214598bbc471e2aa2eda62c9361c8bd6d34fce78f72bb' 
  AND token = 'RT0Z1oWzNE0oEh4LE/P2FlGGZVF+jYHeVC/SLb4FEo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}